You need something with a macro mode and that starts at an equivalent focal length of 28mm or wider (24mm would be better). Since you have a standard zoom for your Canon, I would guess a superzoom is not necessary.

I think you have 2 options - mirrorless or large sensor compact. Both are more compact without over-compromising on quality.

You have many options, but also lots of time. The market will look different by the time you need the camera.

The best value out there is currently with the micro 4/3 cameras. The Panasonic GF3, G3, and Olympus EPM1 can all be had for under £250 with the kit lens if you shop around. The G3 is the best value with the newer sensor, but all have a sensor far larger than any compact you would be looking at.